Thread: Electric water pump

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Everyone is correct in saying that electric pumps are really meant for race cars. I have seen guys who run them on the street with no problems but if there is a failure far from home, then you're done.
Electric pumps only push so many GPM(gallons per minute). The best one on the market is Mezerie that pushes 55GPM. But the one thing that isn't said is what the true GPM is once the pump is attached to the block. Then static pressure comes into play and the GPM is reduced. I work for a cooling company and we did a test and found that after attaching the pump, it now flowed 27GPM not 55.
An electric pump will push the same GPM at idle and also at speed. At idle you're not making that much power, but out at highway speeds you're making more power which is also more heat. But the pump is still only pushing the same GPM as if you're at idle.
A stock belt driven pump will make 45-50 GPM and at highway speed, it can be 90-120 GPM depending on pulley size.
Get a good belt driven pump with an overdrive on the pulley(smaller pump pulley,larger crank pulley ) and you will be much better off.

Few words,, I have this on my 34 Ford (350 CI) and love it. The Davies Craig EWP.

Davies Craig Electric Water Pumps Demonstration - Performance Garage - YouTube

Originally Posted by chopt50wgn

Everyone is correct in saying that electric pumps are really meant for race cars. I have seen guys who run them on the street with no problems but if there is a failure far from home, then you're done.
Electric pumps only push so many GPM(gallons per minute). The best one on the market is Mezerie that pushes 55GPM. But the one thing that isn't said is what the true GPM is once the pump is attached to the block. Then static pressure comes into play and the GPM is reduced. I work for a cooling company and we did a test and found that after attaching the pump, it now flowed 27GPM not 55.
An electric pump will push the same GPM at idle and also at speed. At idle you're not making that much power, but out at highway speeds you're making more power which is also more heat. But the pump is still only pushing the same GPM as if you're at idle.

A stock belt driven pump will make 45-50 GPM and at highway speed, it can be 90-120 GPM depending on pulley size.
Get a good belt driven pump with an overdrive on the pulley(smaller pump pulley,larger crank pulley ) and you will be much better off.

This pretty much sez it all.....leave race car parts to the race cars!!!!! Drag racing, we've had to go to a cool down unit between rounds to get the temp out which should speak to the inefficiency of the electric pumps..... Main reason they're on a drag car is to allow the engine to build heat quickly (I like 195 to 200) from start up, through burn out, to stage and launch.....

Chopt 50 does this cooling stuff for a living, seems he's a most reliable person to take advice from concerning electric water pumps on the street!!!!!